Add script to install required tools.
Update tool building instructions to include pkg-config and libtool.
Remove duplicate copy of Foundation.framework from the project.
Latest libcurl.
Updated version check test.
Merge remote-tracking branch 'upstream/v4.x-beta'

Conflicts:
	CURLHandleSource/CURLHandle.xcodeproj/project.pbxproj
	CURLHandleSource/built/include/curl-i386/curl/curlver.h
	CURLHandleSource/built/include/curl-x86_64/curl/curlver.h
	CURLHandleSource/built/libcares.dylib.dSYM/Contents/Resources/DWARF/libcares.dylib
	CURLHandleSource/built/libcurl.dylib
	CURLHandleSource/built/libcurl.dylib.dSYM/Contents/Resources/DWARF/libcurl.dylib